join b in _materialRepository on a.MaterialId equals b.Id into bTemp from bLeftJoin in bTemp.DefaultIfEmpty()
时间: 2024-02-15 19:51:20 浏览: 17
这是 C# 中使用 LINQ 进行左连接查询的语句。
其中,`_materialRepository` 是一个数据仓储(Repository),`a.MaterialId` 是当前查询对象的属性,`b.Id` 是数据仓储中的属性。`into bTemp` 是将左连接查询的结果赋值给一个临时变量 `bTemp`,`from bLeftJoin in bTemp.DefaultIfEmpty()` 是将 `bTemp` 中的结果进行空值处理后赋值给 `bLeftJoin`。
这段代码的作用是:在当前查询对象中,根据 `MaterialId` 属性与数据仓储 `_materialRepository` 中的 `Id` 属性进行左连接查询,将查询结果赋值给 `bLeftJoin` 变量。如果查询结果为空,则将 `bLeftJoin` 变量赋值为默认值(例如 `null`)。
相关问题
var list1 = from a in _buildingsLayerRepository join b in _buildingsRepository on a.ID equals b.Id into bb from bbdata in bb.DefaultIfEmpty() select new { info1 = a, };
这是一个 LINQ 查询语句,用于从 _buildingsLayerRepository 和 _buildingsRepository 中获取数据,并将它们进行联接。最终返回一个匿名类型的列表,其中包含 a 表中的所有数据以及与之关联的 b 表中的数据(如果有的话)。在这个列表中,每个元素都包含一个名为 info1 的属性,它的值是 a 表中的数据。
将以下linq代码转为sql server var query = from a in _AppointmentInfoDAL.Table.Where(a => a.Code == appointmentCode) join ad in _AppointmentDetailDAL.Table.Where(a => hisKeys.Contains(a.HisKey)) on a.Code equals ad.MasterCode join d in _InspectionItemDetailDAL.Table on ad.ItemCode equals d.Code join h in _HisBillInfoDAL.Table.Where(a => a.Status == 0) on ad.HisKey equals h.ItemId join pn in _PartNameDAL.Table on ad.PartCode equals pn.Code into pn2 from pn3 in pn2.DefaultIfEmpty() from i3 in _InspectionItemNoteDAL.Table.Where(p => p.InspItemCode == a.InspectionCode && (p.Type == 0 || p.Type.ToString() == a.PatientType)).DefaultIfEmpty() join p in _PatientInfoDAL.Table on a.PatientCode equals p.Code join e in _ExamineRoomInfoDAL.Table on a.RoomCode equals e.Code join it in _InspectionItemDAL.Table on d.InspItemCode equals it.Code join di in _DepartmentInfoDAL.FindList() on e.DeptCode equals di.Code join ph in _PhysicalRoomInfoDAL.Table on a.PhysicalRoomCode equals ph.Code into ph2 from ph3 in ph2.DefaultIfEmpty()
SELECT *
FROM AppointmentInfo a
INNER JOIN AppointmentDetail ad ON a.Code = ad.MasterCode
INNER JOIN InspectionItemDetail d ON ad.ItemCode = d.Code
INNER JOIN HisBillInfo h ON ad.HisKey = h.ItemId
LEFT OUTER JOIN PartName pn ON ad.PartCode = pn.Code
LEFT OUTER JOIN InspectionItemNote i3 ON i3.InspItemCode = a.InspectionCode AND (i3.Type = 0 OR CAST(i3.Type AS varchar) = a.PatientType)
INNER JOIN PatientInfo p ON a.PatientCode = p.Code
INNER JOIN ExamineRoomInfo e ON a.RoomCode = e.Code
INNER JOIN InspectionItem it ON d.InspItemCode = it.Code
INNER JOIN DepartmentInfo di ON e.DeptCode = di.Code
LEFT OUTER JOIN PhysicalRoomInfo ph3 ON a.PhysicalRoomCode = ph3.Code
WHERE a.Code = appointmentCode AND hisKeys.Contains(ad.HisKey) AND h.Status = 0
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